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A review on current conventional and biotechnical approaches to enhance biosynthesis of steviol glycosides in Stevia rebaudiana

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Chinese Journal of Chemical Engineering 2021年第2期34卷 92-104页

作者： Samra Basharat Ziyang Huang Mengyue Gong Xueqin Lv Aqsa Ahmed Iftikhar Hussain Jianghua Li Guocheng Du Long Liu Science Center for Future Foods Jiangnan UniversityWuxi 214122China Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of EducationJiangnan UniversityWuxi 214122China School of Food Science and Technology Jiangnan UniversityWuxi 214122China

Stevia rebaudiana Bertoni is commonly called stevia and mostly found in the north east regions of South *** is an herbaceous and shrubby plant belonging to the Asteraceae *** is considered as a natural sweetener and a commercially important plant *** leaves of *** contain steviol glycosides(SGs)which are highly potent and non-caloric *** sweetening property of *** is contributed to the presence of these high potency,calorie free steviol *** are considerably suitable for replacing sucrose and other artificial sweetening agents which are used in different industries and *** amount in the plant mostly varies from 8%to 10%,and the enhancement of SGs is always in *** glycosides have the potential to become healthier alternatives to other table sugars for having desirable taste and zero *** are almost 300 times sweeter than *** used as alternative sugar intensifier the commercial value of this plant in biopharmaceutical,food and beverages industries and in international market is increasing day by *** have made stevia an important part of the medicinal world as well as the food and beverage industry,but the limited production of plant material is not fulfilling the higher global market ***,researchers are working worldwide to increase the production of important SGs through the intercession of different biotechnological approaches in *** review aims to describe the emerging biotechnological strategies and approaches to understand,stimulate and enhance biosynthesis of secondary metabolites in *** and biotechnological methods for the production of steviol glycosides have been briefly reviewed and discussed.

关键词： steviol glycosides Biosynthesis Secondary metabolites Stevia rebaudiana

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Potassium deficiency inhibits steviol glycosides synthesis by limiting leaf sugar metabolism in stevia(Stevia rebaudiana Bertoni)plants

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Journal of Integrative Agriculture 2021年第11期20卷 2932-2943页

作者： SUN Yu-ming HUANG Xiao-lei ZHANG Ting YANG Yong-heng CHENG Xiao-fang XU Xiao-yang YUAN Hai-yan Jiangsu Key Laboratory for the Research and Utilization of Plant Resources/The Jiangsu Provincial Platform for Conservation and Utilization of Agricultural Germplasm Institute of BotanyJiangsu Province and Chinese Academy of SciencesNanjing 210014P.R.China College of Resources and Environment Shanxi Agricultural UniversityTaigu 030801P.R.China College of Arts and Sciences Shanxi Agricultural UniversityTaigu 030801P.R.China

The steviol glycosides(SGs)in stevia(Stevia rebaudiana Bertoni)leaves are becoming increasingly valuable due to its high sweetness but low calorific value,which is driving the development of stevia commercial *** fertilization management can effectively increase SGs productivity,but knowledge on the relationship between potassium(K)fertilization and SGs production is still *** this study,pot experiments were conducted in order to investigate the effect of K deficiency on SGs synthesis in stevia leaves,as well as the underlying *** results showed that when compared with standard K fertilization,K deficiency treatment has no significant effect on the biomass of stevia plant grown in a given soil with high K ***,K deficiency critically decreased leaf SGs contents as well as the expression of SGs synthesis-related *** contents of different sugar components decreased and the activities of sugar metabolism-related enzymes were inhibited under the K deficiency ***,spraying sucrose on the leaves of stevia seedlings diminished the inhibitory effect caused by K *** results also revealed the significant positive correlations between sucrose,glucose and SGs ***,our results suggest that K deficiency would suppress the synthesis of SGs in stevia leaves,and this effect may be mediated by the leaf sugar *** findings provide new insights into the improvement of SGs production potential.

关键词： Stevia rebaudiana Bertoni steviol glycosides potassium deficiency sugar metabolism

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Isolation and functional analysis of SrMYB1,a direct transcriptional repressor of SrUGT76G1 in Stevia rebaudiana

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Journal of Integrative Agriculture 2023年第4期22卷 1058-1067页

作者： ZHANG Ting ZHANG Yong-xia SUN Yu-ming XU Xiao-yang WANG Yin-jie CHONG Xinran YANG Yong-heng YUAN Hai-yan Institute of Botany Jiangsu Province and Chinese Academy of Sciences(Nanjing Botanical Garden Mem.Sun Yat-sen)Nanjing 210014P.R.China Jiangsu Key Laboratory for the Research and Utilization of Plant Resources Nanjing 210014P.R.China

SrUGT76G1,the most well-studied diterpene glycosyltransferase in Stevia rebaudiana,is key to the biosynthesis of economically important steviol glycosides(SGs).However,the molecular regulatory mechanism of SrUGT76G1 has rarely been *** this study,we identified a MYB transcription factor,SrMYB1,using a yeast one-hybrid screening ***1 belongs to the typical R2R3-type MYB protein and is specifically localized in the nucleus with strong transactivation *** transcript of SrMYB1 is predominantly accumulated in flowers,but is also present at a lower level in *** one-hybrid and electrophoretic mobility shift assays verified that SrMYB1 binds directly to the MYB binding sites in the F4-3 fragment(+50–(–141))of the SrUGT76G1 ***,we found that SrMYB1 could significantly repress the expression of SrUGT76G1 in both epidermal cells of tobacco leaves and stevia *** together,our results demonstrate that SrMYB1 is an essential upstream regulator of SrUGT76G1 and provide novel insight into the regulatory network for the SGs metabolic pathway in ***.

关键词： Stevia rebaudiana SrUGT76G1 MYB transcription factor transcriptional regulation steviol glycosides

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Compounds from Stevia rebaudiana Bertoni leaves: An overview of non-conventional extraction methods and challenges

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Food Bioscience 2022年第2期46卷 108-121页

作者： Dj´essica Tatiane Raspe Camila da Silva Silvio Cl´audio da Costa ograma de P´os-Graduaç˜ao em Ciˆencia de Alimentos Universidade Estadual de Maring´aAv.Colombo579087020-900Maring´aPRBrazil Departamento de Tecnologia Universidade Estadual de Maring´aAv.ˆAngelo Moreira da Fonseca180087506-370UmuaramaPRBrazil Departamento de Bioquímica Universidade Estadual de Maring´aAv.Colombo579087020-900Maring´aPRBrazil

To overcome the inconveniences related to its conventional obtainment of natural sweeteners and active compounds from Stevia rebaudiana Bertoni,methods involving application of technology,such as ultrasound assisted extraction,microwave assisted extraction,extraction under pressurized conditions by means of pressurized liquid extraction,subcritical water extraction and supercritical fluid extraction have been *** this review,these emerging techniques were analyzed and discussed,the process variables and operational strategies,their impacts on the extraction and their comparison against the conventional techniques were *** and the possibility of operational automation,the use of less energy and solvents,in addition to the reduced complexity of the subsequent purification steps,make up viable alternatives suitable for a possible industrial *** processes leverage the concept of green chemistry,but still suffer limitations related to acquisition and maintenance costs,in addition to the effects of the action of some of these technologies remaining unexplored.

关键词： Active compounds Natural sweeteners steviol glycosides Technology application

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